2024/03/04 by Quang H. Tran, Brendan P. Bowler, Tran, Quang H. +15 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2403.02378
openalex publication_date 2024/03/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report the discovery of a hot Jupiter candidate orbiting HS Psc, a K7 (≈0.7 M_\odot) member of the ≈130 Myr AB Doradus moving group. Using radial velocities over 4 years from the Habitable-zone Planet Finder spectrograph at the Hobby-Eberly Telescope, we find a periodic signal at Pb = 3.986-0.003+0.044 d. A joint Keplerian and Gaussian process stellar activity model fit to the RVs yields a minimum mass of mp sin i = 1.5-0.4+0.6 MJup. The stellar rotation period is well constrained by the Transiting Exoplanet Survey Satellite light curve (Prot = 1.086 ± 0.003 d) and is not an integer harmonic nor alias of the orbital period, supporting the planetary nature of the observed periodicity. HS Psc b joins a small population of young, close-in giant giant planet candidates with robust age and mass constraints and demonstrates that giant planets can either migrate to their close-in orbital separations by 130 Myr or form in situ. Given its membership in a young moving group, HS Psc represents an excellent target for follow-up observations to further characterize this young hot Jupiter, refine its orbital properties, and search for additional planets in the system.